SARGENT Timer Model - TMR2 Multi-Function User Manual

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6.1 ON DELAY

On delay functions as follows: When the timer is first powered, the delay begins with the

relay deenergized. When the delay expires, the relay energizes and stays energized until

power is removed from the timer. The unit is then ready for the next operation. The on

delay function is considered "self triggering" and the "T" (trigger) terminal is not used. If the

unit is unpowered and repowered before the delay expires, the time restarts without the

relay energizing.

To call up the on delay mode, Dip Switch 2 must be turned on (it is factory set off).

This is an additional step to having set Dip Switches 3 and 4 on. This makes the unit self

triggering as it "looks" for an open circuit between "T" and "+". If Dip Switch 2 is left off,

you will get the somewhat different mode described in the next section.

In the other modes, you use a trigger input from an N.O. or N.C. switch. Since the on delay

mode is self triggering and begins when the timer is powered, it appears that only a normally

open switch can be used. There is a way around this however if you have only a normally

closed signal available. The "R" terminal is employed. The timer should be powered

continuously with the normally closed external switch connected between "+" and R. With

the board in continuous reset, it will not start timing. When the switch opens, it will be as if

the board was just powered and it will go through its on delay cycle until the switch closes

again putting the board into reset.

6.2 TRIGGERED ON DELAY

Triggered on delay differs from standard on delay in that a momentary trigger latches in the

on delay function. To set up triggered on delay, Dip switches 3 and 4 are turned on and Dip

Switch 2 is turned off. Then, an N.O. switch is connected between "T" and "+". The

board should be continuously powered and when the trigger first closes , the delay period

will begin. Successive operations of the trigger will have no effect. When the unit times out,

the relay will energize and will stay energized until a second momentary switch closes

between the reset terminal ("R") and "+". Triggered on delay can only be initiated and reset

from normally open switches.

6.3 OFF DELAY

Off delay functions as follows: The timer is continuously powered and an external switch is

closed to trigger the function. This is done by connecting the "+" terminal to the T (trigger)

terminal. Once the trigger is closed to the + terminal, the relay energizes. If the trigger is

left closed, the relay will stay energized indefinitely. Once the trigger is opened, the delay

begins. The relay stays energized until time out and then it deenergizes ready for the next

operation. The term "off delay" is derived from the fact that timing begins when the trigger

is opened (turned off).

If the trigger is closed and opened again during the delay, the relay will stay energized but

the time set will begin again. This aspect of the off delay function is called retriggerability.

The delay can be extended any number of times by retriggering without the relay

deenergizing.

6.4 ONE SHOT

One shot can be considered non-retriggerable off delay. The timer is continuously powered

and an external switch is closed to trigger the function. This is done by connecting the "+"

terminal to the T (trigger) terminal. Once the trigger is closed to the + terminal, the relay

energizes and deenergizes after time out regardless of the state of the trigger switch. The

trigger switch can remain closed or can be switched during the timing cycle without affecting

the fact that the relay will deenergize after time out. The switch must then go from open to

closed to start a new cycle.